Suppose that c2 = 1.0 and that A = -20.0C. Find the value of c1 required to

Question:

Suppose that c2 = 1.0 and that A = -20.0°C. Find the value of c1 required to maintain an equilibrium temperature of 40.0°C when r = 1.0 and when r = 2.0. Which organism needs to generate less heat to maintain its temperature?
Suppose that an endothermic (warm-blooded) animal generates heat at a rate proportional to its metabolic rate with constant c1, and loses heat at a rate proportional to its surface area with constant c2. Heat loss is also proportional to the difference between its temperature and the ambient temperature A as in Newton's Law of Cooling. The temperature T of a conveniently spherical creature of radius r would then follow